How do I edit the label box color?

The template I am using for a purchase order form has orange for the label boxes; e.g., Name, Address, etc.

My client wishes to use a blue color for these boxes.  I only find a choice for editing the color of the backgrounds and fonts.  Where do I edit these items?

Here is the form:

https://form.jotform.com/201466727879167

Hi,

Please add this custom CSS code to your form:

.form-label-top, .form-label-left, .form-label-right {

background: #4c72fb !important;

}

To add it to your form, please follow this guide: 

https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes